文摘
Background The derivatives of thieno[2,3-b]thiophene belong to a significant category of heterocyclic compounds, which have shown a wide spectrum of medical and industrial application. Results A new building block with two electrophilic center of thieno[2,3-b]thiophene derivatives 2 has been reported by one-pot reaction of diketone derivative 1 with Br2/AcOH in excellent yield. A variety of heteroaromatics having bis(1H-imidazo[1,2a] benzimidazole), bis(1H-imidazo[1,2-b][1,2,4]triazole)-3-methyl-4-phenylthieno[2,3-b]thiophene derivatives, dioxazolo-, dithiazolo-, and 1H-imidazolo-3-methyl-4-phenylthieno[2,3-b]thiophene derivatives as well pyrrolo, thiazolo -3-methyl-4-phenylthieno[2,3-b]thiophene derivatives have been designed, synthesized, characterized, and evaluated for their biological activity. Compounds 3-strong class="a-plus-plus">9 showed good bioassay result. These new derivatives were evaluated for anti-cancer activity against PC-3 cell lines, in vitro antioxidant potential and β-glucuronidase and α-glucosidase inhibitory activities. Compound 3 (IC50--6.26?±-.18-em class="a-plus-plus">μM) showed a potent DPPH radical scavenging antioxidant activity and found to be more active than standard N-acetylcystein (IC50--05.9?±-.1-em class="a-plus-plus">μM). Compounds 8a (IC50--3.2?±-.34-em class="a-plus-plus">μM) and 8b (IC50--4.1?±-.28-em class="a-plus-plus">μM) found as potent inhibitor of α-glucusidase several fold more active than the standard acarbose (IC50--41?±-.73-em class="a-plus-plus">μM). Most promising results were obtained in β-glucuronidase enzyme inhibition assay. Compounds 5 (IC50--.13?±-.019-em class="a-plus-plus">μM), 6 (IC50--9.9?±-.285-em class="a-plus-plus">μM), 8a (IC50--.2?±-.0785-em class="a-plus-plus">μM) and 9 (IC50--.003?±-.09-em class="a-plus-plus">μM) showed a potent inhibition of β-glucuronidase. Compound 9 was found to be several hundred fold more active than standard D-Saccharic acid 1,4-lactone (IC50--5.75?±-.16-em class="a-plus-plus">μM). Conclusions Synthesis, characterization, and in vitro biological activity of a series of thieno[2,3-b]thiophene have been investigated.